In addition, the outflow from the R11 and NCP5662 GND terminal to the load current is less than 4mA 2A compared to little effect. C8 to improve the transient response characteristics of the power. Edit this section semiconductor laser power trends. With the increasingly widespread application of semiconductor laser, the corresponding drive power requirements have become more diversified, with data processing, condition monitoring, fault diagnosis and output control of intelligent semiconductor laser power semiconductor laser power development direction. In this paper, the AMD-PDT treatment instrument laser power LD-pumped solid state laser power for the development of objectives, use a microcontroller as the core system control, focusing on the composition and implementation of intelligent semiconductor machine laser power. The full text is divided into three parts. The first part is an overview of part of the intelligent instrument, described in detail the development of intelligent instruments, principles and characteristics. And the cost of manufacturing green laser pointer or blue laser pointer is less.
The second part first describes the operating characteristics of semiconductor lasers, including the mutual relations of the output optical power of semiconductor lasers, spectroscopy, operating temperature and injection current; then introduced the principle of the composition of the like semiconductor lasers, power, and finally gradually summed up the intelligent semiconductor machine laser The power of the model. The third part is the realization of intelligent semiconductor laser power, a detailed analysis of the hardware design and software programming of the instrument to control the power of AMD-PDT treatment in Chapter IV; in the hardware design part, the focus of the semiconductor laser drive circuit and equipment interactive interface - LCD and touch screen. Microcontroller-based semiconductor laser power control system design. Semiconductor laser (LD) small size, light weight, high conversion efficiency, power, and can be directly modulated. Especially green laser pointer is used for their practical use.
Based on his many advantages, it has been in the field of scientific research, industrial, military, medical and other increasingly widely used, while the drive power and more attention has been paid. MCU procedures for control of the laser drive power, not only can effectively achieve the above functions, but also improves overall degree of automation. Provide favorable conditions for performance improvement and expansion of the laser driver power. The principle of this system shown in Figure 1, the main current source and protection of optical power feedback control, temperature control, false alarms and the keyboard and display functions, the entire system is controlled by microcomputer. The system selected on C8051F. C8051F MCU is a fully integrated mixed-signal system-on-chip (SOC), a single chip constitute a single chip data acquisition or control system required for almost all analog and digital peripherals, and other features. Even, green laser pointer wireless presenter with the special logo and design can be used to express feelings.
As used in this system the ADC and DAC. These peripheral parts of the highly integrated design of small size, low power consumption, high reliability, high-performance single-chip applications, but also greatly reduce the cost of the system. Optical power and temperature sampling the analog signal amplified by the internal microcontroller A / D conversion to digital signals, computing processing, feedback control signal by the internal the D / A conversion and then were sent to the laser current source circuit and the temperature control circuit, the formation of light The closed-loop control of power and temperature. The optical power set from the keyboard input, and the LED digital display of laser power and current data. The semiconductor laser power control system design. Currently, all high-precision constant current source, the majority are using the integrated operational amplifier. The basic principle is the negative reaction, so that added to the comparative amplifier the two input voltages are equal, thereby maintaining a constant output current. The use and operation of the green laser wireless presenter is also very easy for the customer to master.
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